Facebook:
<a href="javascript:void(0);" onclick="window.open( 'https:\/\/www.facebook.com\/sharer\/sharer.php?u=' + encodeURIComponent( location.href ), 'social-share-dialog', 'height=' + Math.min( 436, screen.availHeight ) + ',width=' + Math.min( 626, screen.availWidth ) + ',left=' + Math.max( 0, ( ( document.documentElement.clientWidth - 626 ) / 2 + window.screenX ) ) + ',top=' + Math.max( 0, ( ( document.documentElement.clientHeight - 436 ) / 2 + window.screenY ) ) ); return false;">Share on Facebook</a>

Twitter:
<a href="javascript:void(0);" onclick="window.open( 'https:\/\/twitter.com\/share?url=' + encodeURIComponent( location.href ), 'social-share-dialog', 'height=' + Math.min( 436, screen.availHeight ) + ',width=' + Math.min( 626, screen.availWidth ) + ',left=' + Math.max( 0, ( ( document.documentElement.clientWidth - 626 ) / 2 + window.screenX ) ) + ',top=' + Math.max( 0, ( ( document.documentElement.clientHeight - 436 ) / 2 + window.screenY ) ) ); return false;">Share on Twitter</a>

Google:
<a href="javascript:void(0);" onclick="window.open( 'https:\/\/plus.google.com\/share?url=' + encodeURIComponent( location.href ), 'social-share-dialog', 'height=' + Math.min( 436, screen.availHeight ) + ',width=' + Math.min( 626, screen.availWidth ) + ',left=' + Math.max( 0, ( ( document.documentElement.clientWidth - 626 ) / 2 + window.screenX ) ) + ',top=' + Math.max( 0, ( ( document.documentElement.clientHeight - 436 ) / 2 + window.screenY ) ) ); return false;">Share on Google+</a>

LinkedIn:
<a href="javascript:void(0);" onclick="window.open( 'https:\/\/www.linkedin.com\/shareArticle?mini=true&url=' + encodeURIComponent( location.href ), 'social-share-dialog', 'height=' + Math.min( 436, screen.availHeight ) + ',width=' + Math.min( 626, screen.availWidth ) + ',left=' + Math.max( 0, ( ( document.documentElement.clientWidth - 626 ) / 2 + window.screenX ) ) + ',top=' + Math.max( 0, ( ( document.documentElement.clientHeight - 436 ) / 2 + window.screenY ) ) ); return false;">Share on LinkedIn</a>